Oil-in-water emulsion cosmetics

Abstract

To provide liquid-form oil-in-water emulsion cosmetics that have a total solid oil content of 0.1 wt.% or less while offering superior skin compatibility, a moist feel post-use, and superior stability over time.SOLUTION: Liquid-form oil-in-water emulsion cosmetics contain following components (a)-(c): (a) cellulose, (b) vaseline and (c) hydroxypropyl starch phosphate. Such oil-in-water emulsion cosmetics have a total solid oil content of 0.1 wt.% or less while offering superior skin compatibility, a moist feel post-use, and superior stability over time.SELECTED DRAWING: None

Description

Technical Field

[0005]

[0001] The present invention relates to an oil-in-water type liquid emulsion cosmetic that has good skin affinity while the total content of solid oil is 0.1% by weight or less, has a moisturizing feeling after use, and is excellent in stability over time.

Background Art

[0002] Oil-in-water type emulsion cosmetics sometimes felt poor in skin affinity due to the influence of the polyhydric alcohols and liquid oils contained therein. Further, while the moisturizing feeling after use and skin affinity are improved by containing solid oils such as higher fatty acids, higher alcohols, and waxes, in the case of liquid oil-in-water type emulsion cosmetics such as emulsions, if the content is too high, the fluidity is lost, the usability is poor, or the stability over time deteriorates, and there are points to be improved.

[0003] Regarding the skin affinity, the moisturizing feeling after use, and the stability over time, improvements have been attempted so far. For example, an oil-in-water type emulsion cosmetic (Patent Document 1) containing an acrylamide-based thickener and hydroxypropylmethylcellulose in a solid oil and a surfactant, or a liquid skin external preparation (Patent Document 2) containing a polyalkylene glycol, an amino acid, a polysaccharide polymer having a specific substituent, and water, etc. can be mentioned. <00​​​​​​​​​​​​​​​​​​​​​​ [Problems that the invention aims to solve]

[0006] The present invention aims to provide a liquid oil-in-water emulsion cosmetic that has a total solid oil content of 0.1% by weight or less, yet blends well with the skin, provides a moisturizing feeling after use, and exhibits excellent long-term stability. [Means for solving the problem]

[0007] In other words, the present invention relates to the following components (a) to (c) (a) Cellulose (b) Vaseline (c) Hydroxypropyl starch phosphate The present invention provides a liquid oil-in-water emulsion cosmetic containing the following: component (a) has a content of 2.0 to 8.0% by weight, component (b) has a content of 2.0 to 8.0% by weight, component (c) has a content of 0.2 to 1.0% by weight, and the total content of solid oil is 0.1% by weight or less. [Effects of the Invention]

[0008] The oil-in-water emulsion cosmetic of the present invention is a liquid oil-in-water emulsion cosmetic that has a total solid oil content of 0.1% by weight or less, yet blends well with the skin, provides a moisturizing feeling after use, and exhibits excellent stability over time. [Best Mode for Carrying Out the Invention]

[0009] The content of component (a) cellulose in the present invention is 2.0 to 8.0% by weight, more preferably 3.5 to 6.5% by weight, relative to the oil-in-water emulsion cosmetic. Within this range, excellent stability over time, good skin compatibility, and a good feeling of moisturizing after use are obtained. If the content of component (a) in the present invention is less than 2.0% by weight, it may feel like it does not blend well with the skin, and if it is greater than 8.0% by weight, the stability over time may be poor, or the feeling of moisturizing after use may be less pronounced.

[0010] The component (a) cellulose used in the present invention is a water-insoluble powder, and its average particle size is not particularly limited, but is preferably 5 to 30 μm. Any cellulose that is commonly used in cosmetics can be used. In addition, commercially available cellulose can be used; for example, Chisso's Cellflow C-25 (average particle size 8 to 10 μm) can be used.

[0011] The content of component (b) petrolatum in the present invention is 2.0 to 8.0% by weight, more preferably 2.0 to 6.0% by weight, relative to the oil-in-water emulsion cosmetic. Within this range, excellent stability over time, good skin compatibility, and a good feeling of moisturizing after use are obtained. If the content of component (b) of the present invention is less than 2.0% by weight, the feeling of moisturizing may be less noticeable, and if it is greater than 8.0% by weight, the skin compatibility may be poor.

[0012] The component (b) petrolatum used in this invention is a semi-solid hydrocarbon, and any type commonly used in cosmetics can be used. Commercially available petrolatum can be used; for example, Chloratum V-SO-(JP) from Croda or PERFECTA from Sonneborn can be used.

[0013] The content of component (c) hydroxypropyl starch phosphate of the present invention is 0.2 to 1.0% by weight, more preferably 0.2 to 0.7% by weight, relative to the oil-in-water emulsion cosmetic. Within this range, excellent stability over time, good skin compatibility, and a good feeling of moisturizing after use are obtained. If the content of component (c) of the present invention is less than 0.2% by weight, it may feel like it does not blend well with the skin, and if it is greater than 1.0% by weight, the feeling of moisturizing after use may be less noticeable.

[0014] The component (c) hydroxypropyl starch phosphate used in this invention is a water-soluble polymer, and any type commonly used in cosmetics can be used. Commercially available hydroxypropyl starch phosphate can be used; for example, STRUCTURE XL manufactured by AkzoNobel can be used.

[0015] In this invention, "solid oil" refers to an oil with a hardness of 150 gf or more under conditions of 25°C and atmospheric pressure. Hardness can be measured using a hardness tester (model: RT-3002D) manufactured by Fudo Kogyo Co., Ltd., under the following measurement conditions: adapter diameter of 10 mm, needle insertion speed of 20 mm / min, with the value obtained at 10 mm needle insertion being defined as the hardness.

[0016] The solid oil content used in this invention is 0.1% by weight or less in total relative to the oil-in-water emulsion cosmetic, and may not be included at all. Any solid oil commonly used in cosmetics can be used in this invention. Specifically, examples include lipids such as ceramides and hydrogenated lecithin; sterols such as phytosterols and cholesterol; higher alcohols such as cetanol and behenyl alcohol; higher fatty acids such as stearic acid and behenic acid; waxes such as candelilla wax, carnauba wax, rice wax, beeswax, and paraffin wax; ester oils such as (isostearate / behenic acid)(glyceryl / polyglyceryl-6) esters and lauroyl glutamate di(octyldodecyl / phytosteryl / behenyl); and vegetable oils such as shea butter, Theobroma grandiflorum seed butter, and mango seed butter.

[0017] In addition to the essential components mentioned above, the oil-in-water emulsion cosmetic composition of the present invention may contain, in addition to the essential components mentioned above, other components commonly used in cosmetics, such as nonionic surfactants, anionic surfactants, cationic surfactants, amphoteric surfactants, aqueous components, water-soluble polymers, antioxidants, UV absorbers, fragrances, chelating agents, colorants, and cosmetic ingredients, to the extent that they do not impair the effects of the present invention.

[0018] The oil-in-water type emulsified cosmetic of the present invention is applicable to liquid base cosmetics such as skin lotions and milky lotions, and the form of the oil-in-water type emulsified cosmetic of the present invention is a milky lotion form.

[0019] In the liquid oil-in-water type emulsified cosmetic of the present invention, "liquid" refers to a cosmetic having a viscosity of 1 to 20,000 mPa·s under the environment of 25°C and atmospheric pressure. The viscosity can be measured using a B-type viscometer (model: TVB-10) manufactured by Toki Sangyo Co., Ltd. The measurement conditions are as follows: measuring for 30 seconds at a rotor No. 4 and a rotation speed of 12 rpm. When it is less than 10,000 mPa·s, measure for 30 seconds at a rotor No. 3 and a rotation speed of 12 rpm. When it is less than 2,500 mPa·s, measure for 30 seconds at a rotor No. 2 and a rotation speed of 12 rpm. When it is less than 500 mPa·s, measure for 30 seconds at a rotor No. 1 and a rotation speed of 12 rpm.

Example

[0020] The present invention will be specifically described below with reference to examples, but the technical scope of the present invention is not limited thereto. Regarding the content, unless otherwise specified, it represents weight%.

[0021] (Manufacturing method) The components 1 and 2 that were uniformly mixed were mixed with the components 3 to 7 that were uniformly heated and mixed, and the mixture was heated to 80°C to obtain an oil phase. Next, the components 8 to 15 heated to 80°C were added to the oil phase and emulsified, and then cooled to obtain an oil-in-water type emulsified cosmetic.

[0022] Oil-in-water type emulsified cosmetics having the compositions listed in Tables 1 to 3 below were prepared, and the stability over time and usability (the "good skin affinity" and "moisturizing feeling after use" immediately after using each cosmetic) were evaluated by the following test methods. The results are shown in Tables 1 to 3.

[0023] (Evaluation method) Stability test over time After leaving the sample at 5°C for 1 month, the appearance was observed visually and with a microscope, and judged according to the following criteria. 〇: Regarding the appearance and emulsified particles, no separation, aggregation, or precipitation was observed at all. ×: Separation, aggregation, and precipitation occurred regarding the appearance and emulsified particles.

[0024] Ease of use (how well it blends into the skin) A user test was conducted with a panel of 15 women, who evaluated the product's compatibility with the skin on a two-point scale of "good" and "bad," according to the following criteria. ◎: More than 12 people rated it as having good skin compatibility. ○: 8 to 11 people rated it as having good skin compatibility. △: 4-7 people rated it as having good skin compatibility. ×: Three or fewer people rated it as having good skin compatibility.

[0025] Ease of use (moisturizing effect after use) A user test was conducted with a panel of 15 women, who evaluated the moisturizing effect after use on a two-point scale: "yes" or "no," according to the following criteria. ◎: More than 12 people rated it as having a moisturizing effect. ○: 8 to 11 people rated it as having a moisturizing effect. △: 4-7 people rated it as having a moisturizing effect. ×: Fewer than 3 people rated it as moisturizing.

[0026] [Table 1] *1 NIKKOL Decaglyn 1-M (manufactured by Nikko Chemicals Co., Ltd.) *2 Chloratum V-SO-(JP) (manufactured by Croda) *3 ODM (manufactured by Higher Alcohol Industry Co., Ltd.) *4 Esterol DISM (manufactured by National Mimatsu Co., Ltd.) *5 Pearlream EX (manufactured by NOF Corporation) *6 STRUCTURE XL (manufactured by AkzoNobel) *7 Self-flow C-25 (manufactured by Chisso Corporation) *8 Silica microbead P-1500 (manufactured by JGC Catalysts & Chemicals Co., Ltd.)

[0027] As shown in Examples 1-5 of Table 1, when cellulose was contained at a concentration of 2.0-8.0% by weight, satisfactory results were obtained in all evaluated items. Furthermore, when cellulose was contained at a concentration of 3.5-6.5% by weight, particularly satisfactory results were obtained. On the other hand, as shown in Comparative Examples 1 and 2, when cellulose was contained at a concentration of less than 2.0% by weight or more than 8.0% by weight, satisfactory results were not obtained in terms of skin compatibility, post-use moisturizing effect, and long-term stability. In addition, as shown in Comparative Example 3, when silica was used instead of cellulose, satisfactory results were not obtained in terms of post-use moisturizing effect.

[0028] [Table 2] *9 Plandool-MAS (manufactured by Nippon Seika Co., Ltd.)

[0029] As shown in Examples 6-9 of Table 2, when petrolatum was contained in a concentration of 2.0-8.0% by weight, satisfactory results were obtained in all evaluated items. Furthermore, when petrolatum was contained in a concentration of 2.0-6.0% by weight, particularly satisfactory results were obtained. On the other hand, as shown in Comparative Examples 4 and 5, when petrolatum was contained in a concentration of less than 2.0% by weight or more than 8.0% by weight, satisfactory results were not obtained in terms of skin compatibility and moisturizing effect after use. Furthermore, as shown in Comparative Example 6, when macadamia nut fatty acid phytosteryl was used instead of petrolatum, satisfactory results were not obtained in terms of long-term stability.

[0030] [Table 3] *10 Sunrose FJ08HC (manufactured by Nippon Paper Papilia Co., Ltd.)

[0031] As shown in Examples 10-13 of Table 3, when hydroxypropyl starch phosphate was contained in a concentration of 0.2-1.0% by weight, satisfactory results were obtained in all evaluated items. Furthermore, when hydroxypropyl starch phosphate was contained in a concentration of 0.2-0.7% by weight, particularly satisfactory results were obtained. On the other hand, as shown in Comparative Examples 7 and 8, when hydroxypropyl starch phosphate was contained in a concentration less than 0.2% by weight or more than 1.0% by weight, satisfactory results were not obtained in terms of skin compatibility and post-use moisturizing effect. Furthermore, as shown in Comparative Example 9, when carboxymethylcellulose was used instead of hydroxypropyl starch phosphate, satisfactory results were not obtained in terms of skin compatibility.

[0032] Next, other embodiments of the present invention are shown. In all of Examples 14 to 15, the product blended well with the skin, provided a moisturizing feeling after use, and exhibited excellent stability over time.

[0033] (Example 14: Beauty serum) (Ingredients) (Weight%) (1) Glycerin 4.0 (2) Sucrose palmitate *11 1.0 (3) Polyglyceryl-10 laurate *12 1.5 (4) Squalane 3.0 (5) Octyldodecyl myristate *3 3.0 (6) Jojoba seed oil *13 0.5 (7) Vaseline *2 3.0 (8) Diisostearyl malate *4 2.5 (9) Ceramide NG, Ceramide NP, Ceramide AP, Phytosterols, Hydrogenated Lecithin *14 0.1 (10) Purified water remainder (11) Carbomer 0.15 (12) Hydrolyzed collagen 0.5 (13) Hydroxypropyl starch phosphate *6 0.5 (14) Cellulose *7 4.0 (15) Pentylene glycol 2.5 (16) 1,3-Butylene glycol 10.0 (17) Neutralizing agent: appropriate amount (18) Preservatives: appropriate amount *11 Surf Hope SE COSME C-1616 (manufactured by Mitsubishi Chemical Foods Co., Ltd.) *12 NIKKOL Decaglyn 1-L (manufactured by Nikko Chemicals Co., Ltd.) *13 NIKKOL Jojoba Oil E (manufactured by Nikko Chemicals Co., Ltd.) *14 Phytocompo-C (manufactured by Nippon Seika Co., Ltd.)

[0034] (Manufacturing method) Components 1-3 were uniformly mixed, and then components 4-9, which had been uniformly heated and mixed, were added to form an oil phase. Next, components 10-18 were heated to 80°C, then added to the oil phase, which had also been heated to 80°C, and emulsified. Finally, the mixture was cooled to 30°C to obtain a beauty serum.

[0035] (Example 15: Emulsion) (Ingredients) (Weight%) (1) Glycerin 3.0 (2) Sucrose palmitate *11 1.2 (3) Polyglyceryl-10 laurate *12 1.2 (4) Mineral oil *15 5.0 (5) Isostearyl isostearate *16 2.5 (6) Dimethicone *17 0.5 (7) Vaseline *2 5.0 (8) Diisostearyl malate *4 1.5 (9) Ceramide NG *18 0.1 (10) Purified water remainder (11) Hydroxypropyl starch phosphate *6 0.4 (12) Carbomer 0.05 (13) Xanthan gum 0.2 (14) Cellulose *7 5.0 (15) 1,3-Butylene glycol 7.0 (16) Pentylene glycol 1.5 (17) Sodium hyaluronate 0.1 (18) Neutralizing agent: appropriate amount (19) Preservatives: appropriate amount (20) Flavoring (appropriate amount) *15 CARNATION (manufactured by SONNEBORN) *16 Kurodamol ISIS-LQ-(JP) (manufactured by Croda) *17 DOWSIL(TM)SH 200 C Fluid 10cSt (manufactured by Toray Dow Corning) *18 CERAMIDE TIC-001 (manufactured by Takasago International Corporation)

[0036] (Manufacturing method) Components 1-3 were uniformly mixed, and then components 4-9, which had been uniformly heated and mixed, were added to form an oil phase. Next, components 10-19 were heated to 80°C, then added to the oil phase, which had also been heated to 80°C, and emulsified. After that, component 20 was added, and the mixture was cooled to 30°C to obtain an emulsion. [Industrial applicability]

[0037] According to the present invention, it is possible to provide a liquid oil-in-water emulsion cosmetic that has a total solid oil content of 0.1% by weight or less, yet blends well with the skin, provides a moisturizing feeling after use, and exhibits excellent long-term stability.

Claims

[Claim 1] The following components (a) to (c) (a) Cellulose (b) Vaseline (c) Hydroxypropyl starch phosphate A liquid oil-in-water emulsion cosmetic containing the following, wherein the content of component (a) is 2.0 to 8.0% by weight, the content of component (b) is 2.0 to 8.0% by weight, the content of component (c) is 0.2 to 1.0% by weight, and the total content of solid oil is 0.1% by weight or less.

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